Komatsu issued this shop manual as WEBM003900, and its 286 pages are the factory service book for the PC35R-8 and PC45R-8 hydraulic excavators. That OEM number matters: it marks the genuine Komatsu PC35R-8, PC45R-8 shop manual PDF, not a retyped summary. Hydraulic schematics trace flow from the pump through the control valve and pilot circuit, while wiring diagrams follow the harness from battery to starter and alternator. Testing and adjusting procedures take you through engine speed and hydraulic drift checks, and the maintenance standard section sets wear limits for the swing circle, final drive, sprocket, idler, and track rollers. Warm the oil to 45-55°C (113-131°F) before any drift test, then torque the PC35R-8 final drive screws to 120 Nm on reassembly. A drifting boom is a guess without the spec. Keyword-search the bookmarked PDF, find your number, and put the machine back on the cut.
What's Inside This Komatsu PC35R-8, PC45R-8 Manual
| System | Pages | Key Topics |
|---|
| Structure and Function | 21-102 | Power Train, Swing Machinery, Hydraulic Pump, Control Valve |
| Testing and Adjusting | 103-162 | Engine Speed, Hydraulic Drifts |
| Removal and Installation | 163-248 | Starter Motor, Alternator, Injection Pump, Nozzle Holder, Water Coolant Pump, Cylinder Head, Radiator Group |
| Maintenance Standard | 249-286 | Swing Circle, Swing Machinery, Final Drive, Sprocket, Idler, Track Roller |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| All Models |
| Standard tightening torque for 16mm bolt | 191 ± 21 Nm | p. 12 |
| Hydraulic oil temperature for test conditions | 45-55°C (113-131°F) | p. 120 |
| Check valve spring free length x O.D. | 30.1 x 15.7 mm | p. 270 |
| Check valve spring installed length | 15.7 mm | p. 267 |
| Main Relief Valve Pressure | 245 bar | p. 53 |
| Swing Circle Bolt Torque | 130 Nm | p. 250 |
| PC35R-8 |
| Sprocket wheel screws torque | 120 Nm (88.4 lb.ft.) | p. 214 |
| Working equipment weight | 320 kg | p. 237 |
| Bucket weight | 68 kg | p. 238 |
| Travel Motor High Speed (PC35R-8) | 16.00 cm3/rev | p. 77 |
| Travel Motor Low Speed (PC35R-8) | 26.30 cm3/rev | p. 77 |
| PC35R |
| Clearance between shaft and bushing | 0.144 - 0.196 mm (0.0057 - 0.0077 in.) | p. 259 |
